Falling in love this iMac G4 but being frustrated with AE card install

Question

Hi all, I really DO hope to get some solutions from here about my iMac G4 20" 1.25ghz. I bought this about a week ago as used one, and how much I was excited to adopt this beautifully looking computer..
To make it short, here is my problem;
Becasue this model(iMac G4 1.25ghz flat screen 20") can take Airport Extreme Card for wirelss networking, I bought an Airport Extreme Card and installed it properly which means I securely inserted the card itself and antenna jack too.
and I turned the computer on, the system profiler recognizes it as expected, but *there are no available wireless networks at all*. In my house, there are always several secured wireless networks available.
- No signals at all on the menu bar no matter whether to turnthe Airport On or Off
- "Airport is turned on but is not connected to a network"
SO, I googled this symtom and came up with some possible suggestions such as 'press hard to insert the card and antenna firmly' or 'cleaning the contact of the AE card' or 'try the other card', but none of them did work, still no luck. I tried two different Airport Extreme Card but still no use.
FYI, my router is not apple products but Blitzzz Wireless Router. I have another iMac G4 15"(800MHZ) which has Airport Card(not Extreme)installed, and this iMac G4 15"(800MHZ) picks up all available wireless networks and working just great. And also, my other Windows XP machine alsoworks fine.
According to my researchon the google, there have been some poeple withhaving similar issues and the solution was to connect the card cable fimrly', which is not my case because I triple checked it is securely inserted.
What should I do? Should I just go 'WIRED', 'giving up going wirelessly'?
ANy thoughts or idea?
appreciated any responses,
Kevin
Victoria, BC
PS: When I opened the machine to see any loose cables, I saw two black cable coming down from the top part which has 'HH' marks on, and one with male type is connected to the other cable(female type) coming from the logic board bottom(pretty sure this is for Wireless connection)), and there is another one(looks like female type) which is not connected but sealed with tiny yellow tape(I googled this and got to know it is for Bluetooth setup at the factory).
After all, all with cable connections seem to be fine.
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Answer 1

Hi guys,
here is the outcome so far but still no luck;
1) re-installed Tiger from the scratch and didn't do any update, and the issue was still there(AE card detected but no wireless networks available)
2) and then, did all updates, but still no luck
SO, the next thing I did was to check if the card itself is okay. I took the card and then inserted into my other mac(eMac G4 1.25ghz) and it worked like charm.
then I re-installed the AE card into my iMac G4 20" 1.25ghz. This time, I wanted to check what might be wrong with this machine especially its wireless capability, because that way I can tell if there is any internal damaged or broken wireless cable. Hence the followings are what I did;
1) System Preference -> Sharing -> Internet tab
2) Checked the Airport then clicked Start.(now I am broadcasting internet sharing through the Airport Extreme Card, isn't it? because this machine also has ethernet connection, wired)
3) Now, I went to upstairs where there is iMac G4 15"(800MHZ) equipped with Airport card to see whether it can connect to internet through the iMac G4 20"(1.25ghz).
4) and you know what? actually it can detect the iMac G4 20"(1.25ghz) downstairs.
5) Doesn't this mean that the wireless cable and the AE card itself on the iMac G4 20"(1.25ghz) are at least working???
Anyway, let me try one more with Leopard tomorrow and will let you guys know. If that doesn't even work under Leopard, I will give up the AE card and rather go for USB type wireless adapter as Ken suggested...
Very frustrating...
many thanks and will post any update tomorrow...
Kevin
Victoria, BC